Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2007 Sierra Denali, or another compatible GM vehicle, suffering from frustrating issues like a persistent Check Engine Light, erratic shifting, engine stalling, or poor fuel mileage? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as the brain for your engine and transmission. A faulty PCM can make your reliable truck feel unpredictable and unsafe. This replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s factory performance and dependability.
We take the guesswork and high cost out of the repair. Unlike a generic module from a parts store, this PCM arrives at your door pre-programmed with the latest official GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This means no expensive trip to the dealership for programming. It’s a direct-fit, ready-to-install solution designed to get you back on the road quickly and confidently.
Case Study: A Tricky Diagnosis
I once had a 2005 Silverado 2500 in my bay with a bizarre complaint: it would randomly stall at stoplights, but only after being driven for over an hour on a hot day. There were no consistent trouble codes, just a history of random communication faults. After checking fuel pressure and ignition components, I focused on the PCM. These modules are mounted under the hood, right behind the battery, where they’re exposed to intense heat cycles. Over 15+ years, this can cause internal solder joints to crack, leading to intermittent failures like this one. Swapping in a VIN-programmed PCM like this one solved the problem instantly. The heat-soak issue was gone, and the customer had his reliable work truck back.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention. This 2003-2007 Sierra Denali PCM is designed to correct these exact problems.
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or running rough.
- ✔ Failure to pass a state emissions inspection.
- ✔ Loss of communication with other vehicle modules.
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle in their own driveway with basic hand tools. Our pre-programming service eliminates the most difficult step. Here’s a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible trucks and SUVs, the PCM is located in the engine bay on the driver’s side, near the battery and air filter box.
- Disconnect Connectors: Carefully release the locking tabs and unplug the wiring harnesses from the old PCM. The levers can be stiff, so apply steady pressure.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in by a few small bolts.
- Install the New PCM: Mount your new, VIN-programmed PCM onto the bracket and securely plug in the wiring harnesses. You’ll hear a ‘click’ when they are fully seated.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle will not start until this is completed.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It is guaranteed to fit a wide range of GM trucks and SUVs. Please verify your model and year from the list below. Some 2004 models require matching the ID number 12602802.
This PCM fits many 2003-2007 models, including: GMC Sierra (1500, 2500, 3500, Denali), Chevrolet Silverado (1500, 2500, 3500), Avalanche, Suburban, Tahoe, Cadillac Escalade (ESV, EXT), Hummer H2, GMC Envoy XL, Isuzu Ascender, Chevrolet SSR, and Trailblazer EXT with specified engines and options. The 2003-2007 Sierra Denali PCM is a popular application for this part.
Frequently Asked Questions
Do I need to do anything after I buy this PCM?
Yes. After you complete your purchase, you MUST send us your 17-digit VIN. We cannot program and ship your module without it. This ensures the software is a perfect match for your vehicle’s specific configuration.
Will I need to have this programmed by a dealer?
No. This PCM comes fully programmed with the latest GM updates based on your VIN. This saves you the time and expense of a dealership visit. The only procedure you may need to perform is the security relearn, which requires no special tools.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It usually involves a sequence of key turns and waiting periods. Instructions are readily available online for your specific model, and it’s a necessary step for the vehicle to start.
Is this a plug-and-play part?
Almost. It is a direct physical replacement and is electronically programmed for your vehicle. The only additional step is the security relearn procedure, which makes it a ‘plug-and-relearn’ part. This is standard for any PCM replacement.
How do I find my original part number to verify compatibility?
The service number is printed on a sticker on your original PCM. You can cross-reference it with the compatible numbers listed here (89017750, 12582605, 12589463, etc.). However, as long as your vehicle is on our fitment list, our VIN programming ensures it will work correctly.